opensource music recognition mp3 auto-tagger

many have, all hate it: mp3 files without song, artist and album information. For some reasons, i have a lot of those, it just sucks when you are around, and ask yourself, what song is it?!? well, I think the problem is clear?
MusicBrainz Picard is a very smart opensource tool which creates a "footprint" of your song and looks up all the information. You can save then just the tags, or also rename or even move the files. It also does the cover pic somehow, but I haven't checked it out yet.
It works not with each and every single song, depending on how you got your mp3, but there are ways to give the app a hand.

thanks! I love it.




Btw, it is an example of the semantic web, applied to music. Will write about that, once I got a better idea.